基本思路:
- 连续增减性.
#include<cstdio>
#include<iostream>
using namespace std;
const int MAXN=2e5;
int h[MAXN];
int main(){
int n;
scanf("%d",&n);
for(int i=1;i<=n;i++){
scanf("%d",&h[i]);
}
int ans=0,tmp=0;
for(int i=1;i<=n;i++){
if(h[i]>tmp)ans+=h[i]-tmp;
tmp=h[i];
}
printf("%d\n",ans);
return 0;
}